Record for sound-reproducing machines.



PATENTED APR. 4, 1905.

W. S DARBY. v I RECORD FOR SOUND REPRODUOING MACHINES.

APPLICATION FILED JAN.12, 1905.

IN VENTOR: I /4 ilaa/7zjflaify WITNESSES.

35 without in any UNITED STATES Patented April 4, 1905 PATENT OEEIcE.

WILLIAM SINKLER DARBY, OF BERLIN, GERMANY, ASSIGNOR TO V lOl( )lt TALK] NG-MACHIN E OOMPA NY,

A CORPORATION OF NEW JERSEY.

RECORD FOR SOUND-REPRODUCING MACHINES.

SPECIFICATION forming part of Letters Patent No- 786,347, dated April 4, 1 905.

Application filed January 12, 1905. Serial No. 240,723.

To (all whom it may concern.-

- Be it known that 1, WILLIAM SINKLER DAR- .BY, a citizen of the United States of America, and a resident of Berlin, Germany, have invented certain new and useful- Improvements in Records for Sound Reproducing Machines;

and I do hereby declare that the following is a full, clear, and exact description of the same. This invention relates to improvements in IQ record disks or cylinders for sound-reproducing machines, and has for its object the provision of certain means for determining the correct speed at which said disks or cylinders should revolve in order that the sound pro- 5 duced there-by will have the same pitch as the sounds of the original voice or instrument which are being reproduced therefrom.

Heretofore there has been some difficulty in adjusting the speed of motors used in connectionwithsound-reproducingmachinestocause the disks or cylinders to rotate at the correct speed required to give out the same number of vibrations 'per second or pitch that constituted the original sounds when recorded. For 5 this purpose in some instances speed-indicators in connection with governors for talkingmachine motors have been used; but such devices are not susceptible of delicate adjustment and, added to differences in the quality and 3 consistencies of the material formingthe parts of such governors, have varied greatly in different machines. By the use of the present invention these objections have been avoided in a simple, eificient, and accurate manner and way increasing the cost of making a particular record and without complicating the construction of the talking or reproducing machine.

For a detailed description of one form of' 4 my invention reference may be had to the following specification and drawing, forming a part thereof, in which the figure of the drawing shows a plan view of a record embodying my invention.

In said drawing the numeral 1 denotes the space covered by the main record-groove, which contains the sound vibrations corresponding to a particular selection.

2' denotes an auxiliary spiral groove which containsthe vibrations onlyofaparticularnote 5 .or tone. The auxiliary groove 2 is preferably shifted slightly and caused to form a groove while the original record is still rotating at the same speed as when forming the groove constituting the record of the voice or instrument; but in forming the auxiliary groove only one note or tone is sounded, and such note or tone is a series of successive vibrations caused by the sound produced by one key or 5 note of an instrument or one tone of a voice. The instrument for forming the vibrations of the auxiliary groove may be a reed diaphason, the tuning-fork, the pitch-pipe, or other suitable standard instruments. The original or 7 master record is then reproduced or multiplied in any of the usual ways for supplying duplicates to the trade.

When the records are sold, a standard instrument having the same pitch as the instrument used in forming the auxiliary recordgroove is supplied to the users of the machine.

By the aid of this instrument the user can quickly and accurately adjust the speed of the turn-table or cylinder motor, so that when the 0 stylus or needle of the sound-box is applied to the auxiliary groove the sound produced thereby is exactly of the same pitch as the standard instrument. This may be accomplished in the usual manner of securing uni- 5 son when tuning a violin or other similar musical instrument. When perfect unison has been secured between the sound produced by the auxiliary groove and the standard tuning instrument, the main record will be revolving 9 at the correct speed, and the reproducing apparatus may then be shifted so as to traverse the groove of said main record. It will thus be seen that I have produced a very simple means of determining the correct speed at which a record should revolve, and it is obvions that changes in to rxnd arrangement of parts may be made with it departing from the spirit and scope of In invention; but

WhatI claim my in\ ition, and desire to protect by Letters Patten is 1. In a record for talking-machines,the combination with the main record-groove, of an auxiliary record-groove comprising simple vibrations of definite pitch.

2. In a record for talking-machines,the combination with the main record-groove, of an auxiliary record-groove comprising simple vibrations of a key-note.

of such a number per inch in the length of the groove as will give a. key-note of definite pitch When the record is revolving at the correct speed.

In Witness whereof I have hereunto set my hand this l tth day of December, 1904:.

WILLIAM SINKLER DARBY. Witnesses: S. W. B. MORTMAN,

E. H. CHRISTENSEN. 

